"classical" in inglés with examples - Collocation dictionary inglés
- Their pulsations are related to the same helium instability strip on the Hertzsprung-Russell diagram as that of classical Cepheids.
- As a member of the category of variable stars known as classical Cepheids, it has a regular pulsation frequency that is determined by its mass.
- The North Star (Polaris) is the closest classical Cepheid, but it has many peculiarities and its distance is not certain.
- This is the first classical Cepheid to have a dynamical mass determined from its orbit.
- However, the namesake for classical Cepheids is the star Delta Cephei, discovered to be variable by John Goodricke a few months later.
- The following relation can be used to calculate the distance to Galactic and extragalactic classical Cepheids:
- Over 700 classical Cepheids are known in the Milky Way Galaxy, and several thousand extragalactic Cepheids have been discovered.
- The Hubble Space Telescope has identified classical Cepheids in NGC 4603, which is 100 million light years distant.
- The following relations can also be used to calculate the distance to classical Cepheids:
- The North Star (Polaris) is the closest classical Cepheid, although the star exhibits many peculiarities and its distance is a topic of active debate.
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